book

Node: Up and Running

by Tom Hughes-Croucher, Mike Wilson

April 2012

Intermediate to advanced

204 pages

5h 42m

English

O'Reilly Media, Inc.

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Introduction
Tom’s Thanks

Installing Node.js
Node REPLA First Server
High-Performance Web ServersProfessionalism in JavaScriptBrowser Wars 2.0
Building a Chat Server
The Event Loop
The I/O Problem SpaceUnordered parallel I/OOrdered serial I/O
Error HandlingUsing Multiple Processors
EventsEventEmitterCallback Syntax
HTTP ServersHTTP ClientsMaking HTTP GET requestsUploading data for HTTP POST and PUTThe ClientResponse objectURLquerystring
StreamsReadable streamsFilesystemBuffersA quick primer on binaryBinary and stringsUsing BuffersWorking with stringsconsole.log
DNS
HashingHMACPublic Key CryptographyEncrypting with CipherDecrypting with DecipherCreating signatures using SignVerifying signatures with Verify
process Moduleprocess eventsInteracting with the current Node processOperating system input/outputprocess.stdinprocess.stderrEvent loop and tickersChild Processchild_process.exec( )child_process.spawn( )
NoSQL and Document StoresCouchDBInstallationInstalling CouchDBInstalling CouchDB’s Node moduleUsing CouchDB over HTTPUsing node-couchdbWorking with databasesCreating documentsReading documentsUpdating documentsDeleting documentsRedisInstallationInstalling RedisInstalling Redis’s Node moduleBasic usageHashesListsSetsSorted setsSubscriptionsSecuring RedisMongoDBMongoDB native driverInstallationData typesWriting recordsMongooseInstallationDefining schemasManipulating collectionsPerformance
MySQLUsing NodeDBInstallationSelectionInsertionUpdatingDeletionSequelizePostgreSQLInstallationSelectionInsertion, updates, and deletion
RabbitMQInstalling RabbitMQPublish and subscribeWork queues
ExpressA Basic Express AppSetting Up Routes in ExpressHandling Form DataTemplate EnginesLayouts and partial viewsMiddlewareMiddleware factories
NamespacesUsing Socket.IO with Express
Modules
Searching PackagesCreating PackagesPublishing PackagesLinking

Content preview from Node: Up and Running

Chapter 6. Data Access

Like any web server, Node needs access to data stores for persistent storage; without persistence, all you have is a brochure website, which would make using Node pointless. In this chapter, we’ll run through the basic ways to connect to common open source database choices and to store and retrieve data.

NoSQL and Document Stores

The following NoSQL and document stores are increasingly popular for web-facing applications and are easy to use with Node.

CouchDB

CouchDB provides MVCC-based^[15] document storage in a JavaScript environment. When documents (records) are added or updated in CouchDB, the entire dataset is saved to storage and older versions of that data marked obsolete. Older versions of the record can still be merged into the newest version, but in every case a whole new version is created and written to contiguous memory for faster read times. CouchDB is said to be “eventually consistent.” In a large, scalable deployment, multiple instances can sometimes serve older, unsynced versions of records to clients with the expectation that any changes to those records will eventually be merged into the master.

Installation

Specific CouchDB libraries are not required to access the database, but they are useful for providing a high level of abstraction and making code easier to work with. A CouchDB server is needed to test any examples, but it does not require a lot of work to get it running.